[Cryptography] Windows certificate update breaks/bricks PCs

Peter Gutmann pgut001 at cs.auckland.ac.nz
Sun Dec 14 19:12:56 EST 2014

Microsoft has somehow managed to release a certificate update that (among
other things) disables graphic driver updates, Windows Defender, USB 3.0,
further windows updates, and messes up UAC:


Unfortunately I haven't been able to find any more details on causes, does
anyone know how a certificate update could cause this much trouble?  I'm after
real details here rather than just speculation ("maybe a code-signing cert was


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